CN102418555B - Method for filling mine goaf by utilizing high-concentration all tailing cement - Google Patents
Method for filling mine goaf by utilizing high-concentration all tailing cement Download PDFInfo
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- CN102418555B CN102418555B CN 201110230445 CN201110230445A CN102418555B CN 102418555 B CN102418555 B CN 102418555B CN 201110230445 CN201110230445 CN 201110230445 CN 201110230445 A CN201110230445 A CN 201110230445A CN 102418555 B CN102418555 B CN 102418555B
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Abstract
The invention discloses a method for filling a mine goaf by utilizing a high-concentration all tailing cement. The method comprises the following steps: conveying beneficiation tailing sand pulp to a horizontal sand silo through a pipe so as to be stored, precipitating, overflowing and pulping based on air injection; storing and feeding cements; mixing and stirring for pulping; controlling facilities in a technical process; and blowing a prepared sand pulp filler to a stope for filling by virtue of gravity feed and air injection through drill holes and underground pipe networks, thus reducing the filling cost. By utilizing the method disclosed by the invention, the final concentration of tailing sand filled in the goaf reaches 70-80%, water logging at the goaf can be effectively prevented, the pressure at the bottom of the goaf is reduced, not only can the support function be enhanced, but also the safety factor is high, the production capacity of the stope is enhanced, the resource utilization rate is improved, and higher economic benefits and social benefits are brought.
Description
Technical field
The present invention relates to the method that tailings utilizes in a kind of iron ore mining industry, specifically is to utilize adopting iron ore tailings to the underground goaf placement method.
Background technology
The mine worked-out section backfill is directly to utilize one of effective way of mine tailing.Though existing tailing cemented filling has higher production capacity and good pipeline conveying characteristic, but owing to use a large amount of cement as adhesive material, filling cost is increased, and limited by the pipe gravity flow pipeline transportation concentration, after common tailing cemented filling mass concentration not high (generally below 65%) charges into stope, a large amount of moisture content must be implemented to discharge by drainage, not only increased effluent cost, polluted subsurface environment, and reduced the intensity of obturation, can not play the effect of supporting rock mass, reduce the back production safety factor.
Summary of the invention
In order to make mine worked-out section better obtain backfill, the invention provides the method in goaf under the high concentration all-tailing cemented filling mine.
The present invention adopts following technical scheme to achieve these goals:
The method in goaf under a kind of high concentration all-tailing cemented filling mine is characterized in that may further comprise the steps:
(1) full tailings is carried
The full tailings in ore dressing plant is sent into the horizontal sand of Filling Station storehouse, and filling needs the insufficient section of tailings to be replenished by the tailings storehouse, and sand is got in the tailings storehouse two kinds of methods: the one, get dry sand, and transport Filling Station sand storehouse to by belt or dump truck; The 2nd, in the tailings storehouse, make 40%～50% concentration stock pump and go into the row precipitation dehydration again of the horizontal sand of Filling Station storehouse;
(2) full last mortar preparation
Enter full tailings and the last mortar in the horizontal sand of Filling Station storehouse, in the sand storehouse, carry out natural subsidence, overflow dehydration, overflow water flows into back pool and sewage clarification station, ore dressing plant by bleed off pipe, after treating that sand storehouse full tailings sedimentation concentration reaches about 68%, to the pulping 30～40min that calms the anger of full tailings in the pond, after the pulping of calming the anger is even, can opens the sand storehouse and put the sand valve, supply mortar by pipeline to mixer;
(3) cement seasoning
All-tailing cemented filling material is used Portland cement always, and revolution speed of screw is regulated by variable-frequency governor, and weighing type spiral feeder feeding coal is 10～20t/h, necessary electromotor power 3.5-4kw;
(4) goaf filling under the preparation of filling slurry and the mine
Full last mortar and cement quantitatively enter mixer and stir filling processed and starch through putting sandpipe and weighing type spiral feeder respectively, the mixed proportion of cement and full last mortar is 1: 6-12, make that filling slurry mass concentration is 70.8%～73.6%, the sediment transport pipeline is laid in the goaf under mine, insert Filling Station, by Filling Station the filling slurry is squeezed into goaf under the mine, at the sediment transport pipeline pressure wind arm is installed, press the wind arm to be provided with non retern valve and ball valve, press wind arm and horizontal sediment transport pipe to be 30 ° of angles, when the sediment transport pipeline is squeezed into the filling slurry, charge into Compressed Gas by pressing the wind arm, promote the filling slurry and enter the goaf; Simultaneously under mine on the goaf, especially extraction well is laid at the edge, goaf, establish air exhauster at extraction well, in the defeated filling slurry in goaf under mine, constantly bleeding forms the goaf negative pressure, helps the filling of stretching to the edge zone, goaf of filling slurry.
Detect the slurry preparation quality in the described step (4) and in slurry outlet bottom one section detector tube is set also, Electromagnetic Flow is installed on the detector tube is taken into account that nuclear density meter carries out flow and concentration detects, enter the gravity flow of filling borehole and Underground Backfilling Pipe Network then and be delivered to the dead zone, down-hole and carry out filling.
The goaf is established coal gas and is carried well under mine, coal gas is carried in the well gas pipeline is installed, the gas pipeline front end is equipped with the gas-fired kitchen range, when the sediment transport pipeline is squeezed into the filling slurry, by gas-fired kitchen range point coal gas, constantly consume the oxygen in the goaf, to form negative pressure in the goaf.
Beneficial effect of the present invention:
The present invention has reduced filling cost, makes goaf filling tailings ultimate density reach 70-80%, effectively prevents goaf ponding, reduces the pressure of bottom, goaf; Not only reinforce supporting role but also back production safety factor height, strengthened the production capacity of stope, improved resource utilization, brought bigger economic benefit and social benefit.
Description of drawings
Fig. 1 process chart of the present invention.
The specific embodiment
Embodiment 1: high concentration all-tailing cemented filling method may further comprise the steps:
(1) full tailings is carried
Select the full tailings of factory to send into horizontal sand storehouse, the elected last person of factory mouth pulp consistency is low excessively, and volume is excessive, the threeway of last person's mouth can be inserted tailings storehouse, ground when surpassing the sand holding capacity of bin.Filling needs the insufficient section of tailings to be replenished by the tailings storehouse, and sand is got in the tailings storehouse two kinds of methods: the one, get dry sand, and transport Filling Station sand storehouse to by belt or dump truck; The 2nd, slurrying in the tailings storehouse (40%～50% concentration) pumps into the row precipitation dehydration again of Filling Station sand storehouse;
(2) full last mortar preparation
By selecting the tailings in factory's last mortar and the tailings storehouse to enter the horizontal sand of Filling Station storehouse together, in the sand storehouse, carry out natural subsidence, overflow dehydration, overflow water flows into back pool and selects factory sewage clarification station by bleed off pipe, after treating that Sha Cang ore deposit tailings sedimentation concentration reaches about 68%, the pulping device activates pulping to full tailings in the pond by calming the anger; The pulping device comprises air compressor machine, total blast pipe, air intake arm, valve, electromagnetic valve and the pulping nozzle etc. of calming the anger,
Be 15%～40% full last mortar or dried tailings by the concentration of selecting factory or tailings storehouse to transport, supply sand to the sand storehouse by the emptying point, many places, treat in the sand storehouse after the full last mortar sedimentation and water level surpasses overfall, then open the overflow valve on the relevant position on the sidewall of sand storehouse, the ponding of getting rid of tailings face top in the sand storehouse, ponding flows into back pool for mixing the usefulness of slurry with cleaning, and unnecessary water returns and selects factory's storage cistern interior standby.
After the ponding for the treatment of in the sand storehouse full tailings face top arrange, can open each row pressure gas pulping nozzle in order, to the last mortar pulping of calming the anger entirely in the pond, about 30～40min of time, after the pulping of calming the anger is even, can opens the sand storehouse and put the sand valve, supply mortar by pipeline to mixer.Put during the sand in running order all the time near putting sand end two row pressure gas pulping nozzles, all the other then successively circulation open, whole pulping process all adopts automatic control.
In order to detect and control the feed amount of full last mortar, at the vertical section of putting sandpipe densometer is installed, electromagnetic flowmeter and electrical clip pipe valve, the mixer upper end also is equipped with ultrasonic content gauge, detect tailings concentration respectively, flow and liquid level, and carry out flow and concentration control.The mixer specification is φ 3.0 * 3.5m, motor 37km, production capacity 100m
3/ h; The mixer end opening is inserted in the funnel of filling borehole top by pipeline.
(3) cement seasoning
All-tailing cemented filling material is used 42.5 grades of Portland cements always, and cement is transported to Filling Station through bulk cement tanker, with pressing wind to be discharged in the cement silo by Cang Ding.Cement silo is welded steel plate, diameter phi 6.0m, high 16.0m, the above high 7.5m in the face of land, cement silo dischargeable capacity 350m
3, can contain cement 455t, the cement bin top is provided with sack cleaner, radar level gauge etc.Plate, pinwheel dispenser and the weighing type spiral feeder of adjustable throttle amount is equipped with in the cement bin bottom, and to the quantitative continuous-feeding of mixer, revolution speed of screw is regulated by variable-frequency governor, to satisfy the proportion design requirement.Weighing type spiral feeder feeding coal is 10～20t/h, necessary electromotor power 4kw.
(4) casting resin preparation
Full last mortar and cement quantitatively enter mixer and carry out stirring pulping through putting sandpipe and weighing type spiral feeder respectively.In order to detect the slurry preparation quality, in slurry outlet bottom one section detector tube is set also, Electromagnetic Flow is installed on the detector tube is taken into account that nuclear density meter carries out flow and concentration detects, enter the gravity flow of filling borehole and Underground Backfilling Pipe Network then and be delivered to the dead zone, down-hole and carry out filling.
In order to reduce water to the negative effect of slurry filling quality, it is main that pipeline adopts to calm the anger, and water is the water-gas combined cleaning of assisting, and Filling Station is set up pressure ventilation pipe and gate valve.The down-hole horizontal pipeline is installed above the sediment transport pipeline and is pressed the wind arm then at a certain distance, and arm is provided with non retern valve and ball valve.Press wind arm and horizontal sediment transport pipe to be 30 ° of angles.
Example 2
The method in goaf under the high concentration all-tailing cemented filling mine may further comprise the steps:
(1) full tailings is carried
The full tailings in ore dressing plant is sent into the horizontal sand of Filling Station storehouse, and filling needs the insufficient section of tailings to be replenished by the tailings storehouse, and sand is got in the tailings storehouse two kinds of methods: the one, get dry sand, and transport Filling Station sand storehouse to by belt or dump truck; The 2nd, in the tailings storehouse, make 40%～50% concentration stock pump and go into the row precipitation dehydration again of the horizontal sand of Filling Station storehouse;
(2) full last mortar preparation
Enter full tailings and the last mortar in the horizontal sand of Filling Station storehouse, in the sand storehouse, carry out natural subsidence, overflow dehydration, overflow water flows into back pool and sewage clarification station, ore dressing plant by bleed off pipe, after treating that sand storehouse full tailings sedimentation concentration reaches about 68%, to the pulping 30～40min that calms the anger of full tailings in the pond, after the pulping of calming the anger is even, can opens the sand storehouse and put the sand valve, supply mortar by pipeline to mixer;
(3) cement seasoning
All-tailing cemented filling material is used Portland cement always, and revolution speed of screw is regulated by variable-frequency governor, and weighing type spiral feeder feeding coal is 10～20t/h, necessary electromotor power 3.5-4kw;
(4) goaf filling under the preparation of filling slurry and the mine
Full last mortar and cement quantitatively enter mixer and stir filling processed and starch through putting sandpipe and weighing type spiral feeder respectively, the mixed proportion of cement and full last mortar is 1: 6-12, make that filling slurry mass concentration is 70.8%～73.6%, the sediment transport pipeline is laid in the goaf under mine, insert Filling Station, by Filling Station the filling slurry is squeezed into goaf under the mine, at the sediment transport pipeline pressure wind arm is installed, press the wind arm to be provided with non retern valve and ball valve, press wind arm and horizontal sediment transport pipe to be 30 ° of angles, when the sediment transport pipeline is squeezed into the filling slurry, charge into Compressed Gas by pressing the wind arm, promote the filling slurry and enter the goaf; Simultaneously under mine on the goaf, especially extraction well is laid at the edge, goaf, establish air exhauster at extraction well, in the defeated filling slurry in goaf under mine, constantly bleeding forms the goaf negative pressure, helps the filling of stretching to the edge zone, goaf of filling slurry.
The goaf is established coal gas and is carried well under mine, coal gas is carried in the well gas pipeline is installed, the gas pipeline front end is equipped with the gas-fired kitchen range, when the sediment transport pipeline is squeezed into the filling slurry, by gas-fired kitchen range point coal gas, constantly consume the oxygen in the goaf, to form negative pressure in the goaf.
Claims (3)
1. the method in goaf under the high concentration all-tailing cemented filling mine is characterized in that may further comprise the steps:
(1) full tailings is carried
The full tailings in ore dressing plant is sent into the horizontal sand of Filling Station storehouse, and filling needs the insufficient section of tailings to be replenished by the tailings storehouse, and sand is got in the tailings storehouse two kinds of methods: the one, get dry sand, and transport Filling Station sand storehouse to by belt or dump truck; The 2nd, in the tailings storehouse, make 40%～50% concentration stock pump and go into the row precipitation dehydration again of the horizontal sand of Filling Station storehouse;
(2) full last mortar preparation
Enter full tailings and the last mortar in the horizontal sand of Filling Station storehouse, in the sand storehouse, carry out natural subsidence, overflow dehydration, overflow water flows into back pool and sewage clarification station, ore dressing plant by bleed off pipe, after treating that sand storehouse full tailings sedimentation concentration reaches 68%, to the pulping 30～40min that calms the anger of full tailings in the pond, after the pulping of calming the anger is even, can opens the sand storehouse and put the sand valve, supply mortar by pipeline to mixer;
(3) cement seasoning
All-tailing cemented filling material is used Portland cement always, and revolution speed of screw is regulated by variable-frequency governor, and weighing type spiral feeder feeding coal is 10～20t/h, necessary electromotor power 3.5-4kw;
(4) goaf filling under the preparation of filling slurry and the mine
Full last mortar and cement quantitatively enter mixer and stir filling processed and starch through putting sandpipe and weighing type spiral feeder respectively, the mixed proportion of cement and full last mortar is 1:6 ~ 1:12, make that filling slurry mass concentration is 70.8%～73.6%, the sediment transport pipeline is laid in the goaf under mine, insert Filling Station, by Filling Station the filling slurry is squeezed into goaf under the mine, at the sediment transport pipeline pressure wind arm is installed, press the wind arm to be provided with non retern valve and ball valve, press wind arm and horizontal sediment transport pipe to be 30 ° of angles, when the sediment transport pipeline is squeezed into the filling slurry, charge into Compressed Gas by pressing the wind arm, promote the filling slurry and enter the goaf; Simultaneously under mine on the goaf, the edge, goaf lays extraction well, establishes air exhauster at extraction well, in the defeated filling slurry in goaf under mine, constantly bleeding forms the goaf negative pressure, helps the filling of stretching to the edge zone, goaf of filling slurry.
2. the method in goaf under the high concentration all-tailing cemented filling mine according to claim 1, it is characterized in that: described step (4) also comprises the detection of slurry preparation quality, detect the slurry preparation quality and in slurry outlet bottom one section detector tube is set, Electromagnetic Flow is installed on the detector tube is taken into account that nuclear density meter carries out flow and concentration detects, enter the gravity flow of filling borehole and Underground Backfilling Pipe Network then and be delivered to the dead zone, down-hole and carry out filling.
3. the method in goaf under the high concentration all-tailing cemented filling mine according to claim 1, it is characterized in that: the goaf is established coal gas and is carried well under mine, coal gas is carried in the well gas pipeline is installed, the gas pipeline front end is equipped with the gas-fired kitchen range, when the sediment transport pipeline is squeezed into the filling slurry, by gas-fired kitchen range point coal gas, constantly consume the oxygen in the goaf, to form negative pressure in the goaf.
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